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We're not suggesting "The Situation" as a role model. But there is one hard-body lesson you can take from MTV's Jersey Shore loudmouth: The less body fat you carry, the better your abs will show.

Start by performing triage on the six eating habits listed here. But don’t try to banish them all at once. "Target just one or two behaviors at first—ones that you can make the most difference by changing," says Jennifer McDaniel, R.D., of St. Louis University.

The reason: Recent studies show that we have only so much willpower. That's why trying to break several bad habits at once can be overwhelming. But if you follow the slow and steady approach, you’ll increase your odds of sculpting a thinner, fitter physique—and keeping it for life.